> The issue is the entire array will occasionally pause completely > for about 40 seconds when a file is created. [ ... ] During heavy > file transfer activity, sometimes the system halts with every > other file creation. [ ... ] There are other drives formatted > with other file systems on the machine, but the issue has never > been seen on any of the other drives. When the array runs its > regularly scheduled health check, the problem is much worse. [ > ... ] Looks like that either you have hw issues (transfer errors, bad blocks) or more likely the cache flusher and elevator settings have not been tuned for a steady flow. > How can I troubleshoot and more importantly resolve this issue? Well, troubleshooting would require a good understanding of file system design and storage subsystem design, and quite a bit of time. However, for hardware errors check the kernel logs, and for cache flusher and elevator settings check the 'bi'/'bo' numbers of 'vmstat 1' while the pause happens. For a deeper profile of per-drive IO run 'watch iostat 1 2' while this is happening. This might also help indicate drive errors (no IO is happening) or flusher/elevator tuning issues (lots of IO is happening suddenfly). -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
